What’s Vulnerable › Vulnerabilities

CVE-2020-26307: GHSL-2020-301: Regular Expression Denial of Service (ReDoS) in HTML2Markdown

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-26 · updated 2026-06-17
• Weakness: CWE-1333

Description

HTML2Markdown is a Javascript implementation for converting HTML to Markdown text. All available versions contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.

Affected products

• kates html2markdown: through 1.0.2

References

• https://github.com/kates/html2markdown/issues/13
• https://securitylab.github.com/advisories/GHSL-2020-301-redos-HTML2Markdown/

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